Abstract: Norms and regulations of medieval and early modern Jewish communities forbade Jews from bringing other Jews to trial in front of Christian courts. In spite of this prohibition there were several cases, in which Jews sued other Jews in courts of Christian authorities. One example is a dispute between the Jewish intercessor, Jakob Süßmann , and the Jewish community of Frankfurt , which was processed before the Frankfurt council. The said case, which started as a local affair took a surprising course and affected, in the end, whole Jewish communities in the Holy Roman Empire. Through this case, the essay shows that not only the infraction of, but also compliance with the norms could lead to unexpected complications. In addition, the essay argues that the examination of such court cases would reveal valuable information about Jewish efforts of political organization.